From: Marcelo Tosatti Date: Wed, 28 Nov 2012 01:28:52 +0000 (-0200) Subject: x86: pvclock: introduce helper to read flags X-Git-Tag: firefly_0821_release~3680^2~1462^2~33 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2697902be89d7f38e9736dfe946cd0e5d4f47b80;p=firefly-linux-kernel-4.4.55.git x86: pvclock: introduce helper to read flags Acked-by: Glauber Costa Signed-off-by: Marcelo Tosatti --- diff --git a/arch/x86/include/asm/pvclock.h b/arch/x86/include/asm/pvclock.h index 47e25d464104..ea27a8dd189c 100644 --- a/arch/x86/include/asm/pvclock.h +++ b/arch/x86/include/asm/pvclock.h @@ -6,6 +6,7 @@ /* some helper functions for xen and kvm pv clock sources */ cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src); +u8 pvclock_read_flags(struct pvclock_vcpu_time_info *src); void pvclock_set_flags(u8 flags); unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src); void pvclock_read_wallclock(struct pvclock_wall_clock *wall, diff --git a/arch/x86/kernel/pvclock.c b/arch/x86/kernel/pvclock.c index a7d90910c61a..c8fb043a8695 100644 --- a/arch/x86/kernel/pvclock.c +++ b/arch/x86/kernel/pvclock.c @@ -45,6 +45,19 @@ void pvclock_resume(void) atomic64_set(&last_value, 0); } +u8 pvclock_read_flags(struct pvclock_vcpu_time_info *src) +{ + unsigned version; + cycle_t ret; + u8 flags; + + do { + version = __pvclock_read_cycles(src, &ret, &flags); + } while ((src->version & 1) || version != src->version); + + return flags & valid_flags; +} + cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src) { unsigned version;